/*
 * Copyright (c) 2006-2009 by Abacus Research AG, Switzerland.
 * All rights reserved.
 *
 * This file is part of the Abacus Formula Compiler (AFC).
 *
 * For commercial licensing, please contact sales(at)formulacompiler.com.
 *
 * AFC is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * AFC is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with AFC.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.formulacompiler.compiler.internal.logging;

import java.io.PrintStream;

public final class Logger
{
	private final String indent;
	private final int indentLength;
	private StringBuilder indentation = new StringBuilder();
	private String currentIndentation = "";
	private boolean indentPending = true;


	public Logger()
	{
		this( "\t" );
	}

	public Logger( final String _indent )
	{
		super();
		this.indent = _indent;
		this.indentLength = _indent.length();
	}


	void indent()
	{
		this.indentation.append( this.indent );
		this.currentIndentation = this.indentation.toString();
	}

	void outdent()
	{
		final int l = this.indentation.length();
		if (this.indentLength <= l) {
			this.indentation.setLength( l - this.indentLength );
			this.currentIndentation = this.indentation.toString();
		}
	}

	private void addIndentationIfPending()
	{
		if (this.indentPending) addIndentation();
	}

	private void addIndentation()
	{
		System.out.print( this.currentIndentation );
		this.indentPending = false;
	}


	Logger newLine()
	{
		System.out.print( '\n' );
		this.indentPending = true;
		return this;
	}

	PrintStream stream()
	{
		addIndentationIfPending();
		return System.out;
	}


}
